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參數(shù)資料
| 型號： | MM74HC942 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | MM74HC942 is a full duplex low speed modem |
| 中文描述： | 0.3 kbps DATA, MODEM, PDIP20 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 146K |
| 代理商： | MM74HC942 |
Absolute Maximum Ratings
(Notes 1 & 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
CC
)
Supply Voltage (V
BB
)
DC Input Voltage (V
IN
)
DC Output Voltage (V
OUT
)
Clamp Diode Current (I
IK
, I
OK
)
DC Output Current, per pin (I
OUT
)
DC V
CC
or GND Current, per pin (I
CC
)
Storage Temperature Range (T
STG
)
Power Dissipation (P
D
)
(Note 3)
S.O. Package only
b
0.5 to
a
7.0V
a
0.5 to
b
7.0V
V
BB
b
1.5 to V
CC
a
1.5V
V
BB
b
0.5 to V
CC
a
0.5V
g
20 mA
g
25 mA
g
50 mA
b
65
§
C to
a
150
§
C
600 mW
500 mW
Lead Temp. (T
L
)
(Soldering 10 seconds)
260
§
C
Operating Conditions
Min
4.5
b
4.5
0
Max
5.5
b
5.5
V
CC
Units
V
Supply Voltage (V
CC
)
Supply Voltage (V
BB
)
DC Input or Output Voltage
(V
IN
, V
OUT
)
Operating Temp. Range (T
A
)
MM74HC
V
V
b
40
a
85
§
C
Input Rise or Fall Times
(t
r
, t
f
)
Crystal frequency
500
ns
3.579
MHz
DC Electrical Characteristics
T
e
25
§
C
74HC
Symbol
Parameter
Conditions
T
eb
40 to 85
§
C
Units
Typ
Guaranteed Limits
V
IH
Minimum High Level
Input Voltage
3.15
3.15
V
V
IL
Maximum Low Level
Input Voltage
1.1
1.1
V
V
OH
Minimum High Level
Output Voltage
V
IN
e
V
IH
or V
IL
l
I
OUT
l
e
20
m
A
l
I
OUT
l
e
4.0 mA, V
CC
e
4.5V
V
IN
e
V
IH
or V
IL
l
I
OUT
l
e
20
m
A
l
I
OUT
l
e
4.0 mA, V
CC
e
4.5V
V
IN
e
V
CC
or GND
V
CC
V
CC
b
0.1
3.98
V
CC
b
0.1
3.7
V
V
V
OL
Maximum Low Level
Voltage
0.1
0.26
0.1
0.4
V
V
I
IN
Maximum Input
Current
g
0.1
g
1.0
m
A
I
OZ
Output TRI-STATE
é
Leakage Current
RXD and CD Outputs
ALB
e
SQT
e
V
CC
g
5
m
A
I
CC
, I
BB
Maximum Quiescent
Supply Current
V
IH
e
V
CC
, V
IL
e
GND
ALB or SQT
e
GND
Transmit Level
e b
9 dBm
8.0
12.0
12.0
mA
I
CC
, I
BB
Power Down Supply Current
ALB
e
SQT
e
V
CC
V
IH
e
V
CC
, V
IL
e
GND
300
m
A
Note 1:
Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Note 2:
Unless otherwise specified all voltages are referenced to ground.
Note 3:
Power Dissipation temperature derating D plastic ‘‘N’’ package:
b
12 mW/
§
C from 65
§
C to 85
§
C; ceramic ‘‘J’’ package:
b
12 mW/
§
C from 100
§
C to 125
§
C.
*
The demodulator specifications apply to the MM74HC942 operating with a modulator having frequency accuracy, phase jitter and harmonic content equal to or
better than the MM74HC942 modulator.
2
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